When designing a Bessel filter, it is important to note that the input and output impedances must be equal. The number of poles corresponds to the sum total number of inductors and capacitors.

N g1 g2 g3 g4 g5 g6 g7 g8 g9 g10
012.0000000000
021.57735026920.4226497308
031.25502427190.55278640450.1921893236
041.05982303450.51161693980.31814143850.1104185872
050.93029871250.45770300410.33122172960.20896366260.0718128912
060.83765916070.41157247430.31581986570.23642693280.14803231820.0504892483
070.76765374220.37441343760.29441349830.23783036430.17782592770.11040610020.0374569300
080.71254084000.34455696170.27346070540.22966810130.18668054450.13867145250.08551680810.0289045947
090.66777235760.32027774820.25470271380.21839622950.18592341320.15059696730.11114995720.06819345440.0229871832
100.63050359100.30022296270.23839515700.20663362860.18082399960.15394549190.12404486360.09108097080.05569795180.0187012122
Bessel filter coefficients (N=1 to 10)
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